[tahoe-lafs-trac-stream] [tahoe-lafs] #2025: test storage server behaviour for bad container files

[tahoe-lafs]

#2025: test storage server behaviour for bad container files
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 Reporter:  daira                                |          Owner:
     Type:  defect                               |         Status:  new
 Priority:  normal                               |      Milestone:  soon
Component:  code-storage                         |        Version:  1.10.0
 Keywords:  test error corruption cloud-backend  |  Launchpad Bug:
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 The behaviour of a storage server on shares with a corrupt container (bad
 header or inconsistent length) is insufficiently tested. We should
 simulate various kinds of container corruption (also on a subset of shares
 in a shareset that has more than one share), to test that the correct
 errors are raised.

 See for example [https://github.com/LeastAuthority/tahoe-
 lafs/commit/fd819cea11599cc274b8e1d72bfce0fffea39296#L3R93 this bug],
 which showed that raising {{{CorruptStoredShareError}}} on an immutable
 share with an inconsistent length was untested.

 Note that the code and the intended behaviour (see #1566) has changed on
 the cloud branch so that is what we should test. The cloud backend has
 additional failure modes due to missing or inconsistent chunk objects.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2025>
tahoe-lafs <https://tahoe-lafs.org>
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